Question

Помогите решить пример!

Answer 1

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Answer 2

х^2 – 14х + 49 = х^2 + 20х + 100
– 14х + 49 = 20х + 100
– 14х – 20х = 100 – 49
– 34х = 51
х = – 3/2
х = – 1 1/2